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No. 753,258. PATENTED MAR. l, 1904.

G. W. HART.

BLEGTRIGSWITGH. APPLICATION FILED HOV. 23.1903.

N0 MODEL.

WMM/mwen UNITED STATES Patented March 1, 1904'.

PATENT OFFICE.

GERALD W. HART, OF HARTFORD, CONNECTICUT, ASSIGNOR TO THE HARTMANUFACTURING COMPANY, OF HARTFORD, CONNECTICUT,` A CORPORATION OFJERSEY.

ELECTRIC SWITCH.

SPECIFICATION forming part of Letters Patent No. 753,258, dated March 1,1904. i

Application filed November 28, 1903. Serial No. 182,276. (No model.)

To all whom it may concern:

Be it known that I, GERALD W. HART, a'oitizen of the United States,residing at Hartford, in the county of Hartford, State of Connecticut,have invented certain new and useful Improvements in Electric Switches,of which the following is a full, clear, and exact description.

My invention relates to electrical appliances, and has particularutility in connection with electric switches.

The main object of my invention is to provide a new and effective meansfor insulating and mounting certain current-carrying parts.

In the accompanying drawings, Figure l is a side elevation of anelectric switch, the cap or cover being shown in vertical section. Fig.2 is a plan view of certain detached details of construction, theswitch-blade being shown in dotted outline. Fig. 3 isa relativelyenlarged sectional view on the line 3 3, Fig. 2. Fig. 4 isaverticalsection of a separate detail of construction. Fig. 5 isa plan view ofthe switch contact member detached.

In the particular form and application of my invention shown in thedrawings, l represents the usual porcelain base of an electric switch.'y

2 is the cap or cover.

3 is the operating-handle, usually formed of insulating material.

4 4 are terminals.

5 is a switch blade or plate arranged to electrically connect ordisconnect the terminals 4 4.

6 is a spider which has a suitable mounting upon a rotatable post or hub61.

The switch-blade 5 is mounted upon and insulated from the spider 6, andthe parts are of the switch-blade will stand between a pair of `contactmembers 7 7 The construction of the switch-actuating mechanism isimmaterial to this invention, and therefore need not be described atlength. It is suiiicient to state that when the operatinghandle 3 isturned rotative motion is imparted to the hub or post 61,which in turnrotates the spider 6 and throws the switch-blade 5 either into or out ofcontact with the members 7 7.

The means for mounting and insulating the switch-blade 5 on and from thespider 6 may be described as follows: 8 is a bushing which may bein theform of a sleeve and which may be notched or recessed in its outerperiphery, as at 82, Fig. 4. The switch-blade 5 inV its preferable orinhas an elongated slot, the ends of the slot being of substantially thewidth of the diameter of the sleeve 8 at the bottom of the recess 82.

9 is an insulating-washer arranged to rest upon the spider 6. The sleeveor bushing 8 rests upon the washer 9. Within vthe sleeve or bushing 8 isseated-an insulating-washer l0. One means oi providingasuitable seat forthe washer 10 may comprise a ledge S1.

11 is a rivet which passes through the insulating-washer 10, the sleeve8, washer 9, and spider 6. When this rivet is headedv up, it securelyclamps together the said parts. It should be stated that the rivet 11 issuliiciently smaller than the sleeve 8 so as to make no connectiontherewith. Hence said sleeve 8 is effectively insulated from its support6.

The parts arel assembled by passing the sleeves through the enlargedcentral part of the slot in the switch-blade 5 and then moving themintothe narrow' ends of the slot. The washers may then be applied and therivets passed through said parts and through the spider and nally headedup, as best seen in Fig. 3. I prefer that the switch-blade 5 shall makea/lpgse connection with the bushings 8, and to that end the width of therecesses 82 is slightly greater than the thickness of the metal of theblade or plate 5. By this means should the contact members 7 7 beslightly out oi the plane of movement of the switch-blade 5 the lattermay readily shift or tilt to a sucient extent to make an effectiveconnection between the contact members 7 7 without distorting or bendingthe same.

What I claim is- 1. In a device of the character described, acurrent-carrying blade or plate, a support therefor, a bushing aifordinga bearing forsaid plate, insulating material seated within said bushingand also located between said bushing and said support and means forsecuring said bushing to said support.

2. In a device of the character described, a current-carrying blade orplate, a support therefor, a metallic bushing affording a bearing forsaid plate, insulating material seatedY Within said bushing and alsolocated between said bushing and said support and means for securingsaid metallic bushing to said support said bushing and said supportbeing insulated from each other at all times.

3. In a device of the character described, a currentcarrying blade orplate, a support therefor, a metallic bushing affording a bearing forsaid plate, a supporting ledge or shoulder within said bushing,insulating material seated on said supporting ledge or shoulder andwithin said bushing and also located between and separating said bushingfrom said support and means for securing said bushing to said supportsaid bushing and said support plate, insulating material seated withinsaid bushing and also located between said bushing and said support, arivet passing through said insulating material and said support butinsulated f'rom the former said rivet securing said parts together.

5. In a device of the character described, a current-carrying blade orplate, a support therefor, a bushing affording a bearing for said plate,insulating material seated within said bushing and also located betweensaid bushing and said support and means for securing said bushing tosaid support said parts being insulated from each other at all timessaid blade or plate being loosely held in place by said bushing.

f 6. In a device of the character described, a supporting member, abushing carried thereby, a current-carrying member loosely supported onsaid bushing but insulated from the support for said bushing.

7. In a device of the character described, a current-carrying blade orplate, a support therefor, a bushing aifording a bearing and a supportfor said plate said plate being insulated from said bushing-support saidinsulation being located between said bushing-support and said bushingand means to securely hold said bushing to said support.

Signed at Hartford, Connecticut, this 20th day of November, 1903.

GERALD W. HART.

Witnesses:

H. A. HART, A. I. INGHAM.

